index.php

<?
        $filename = "image_".rand().".png";
        $scan_command = 'scanimage ';
        if(array_key_exists('preview',$_POST) && $_POST['preview']){
                $filename = 'preview.png';
                $scan_command .= '--preview=yes --preview-mode Gray --resolution 50';
        }
        if(array_key_exists('mode',$_POST)){
                $scan_command .= ' --mode ' . $_POST['mode'];
        }
        if(array_key_exists('resolution',$_POST)){
                $scan_command .= ' --resolution ' . $_POST['resolution'];
        }
        if(array_key_exists('l',$_POST)){
                $scan_command .= ' -l ' . $_POST['l'];
        }
        if(array_key_exists('t',$_POST)){
                $scan_command .= ' -t ' . $_POST['t'];
        }
        if(array_key_exists('x',$_POST)){
                $scan_command .= ' -x ' . $_POST['x'];
        }
        if(array_key_exists('y',$_POST)){
                $scan_command .= ' -y ' . $_POST['y'];
        }
        system("$scan_command | convert ppm:- images/$filename");

        header("Content-Type: text/javascript");
        echo '{"success":true,"file_name":"'.$filename.'"}';
?>